+ memory_hotplug-optimise-try_offline_memory_block.patch added to mm-new branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: memory_hotplug: optimise try_offline_memory_block()
has been added to the -mm mm-new branch.  Its filename is
     memory_hotplug-optimise-try_offline_memory_block.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/memory_hotplug-optimise-try_offline_memory_block.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
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fixup patches in mm-new.

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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: memory_hotplug: optimise try_offline_memory_block()
Date: Thu, 6 Nov 2025 20:14:50 +0000

Extract the zone number directly from the page instead of using the page's
zone number to look up the zone and asking the zone what its number is.

Link: https://lkml.kernel.org/r/20251106201452.2292631-3-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memory_hotplug.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/memory_hotplug.c~memory_hotplug-optimise-try_offline_memory_block
+++ a/mm/memory_hotplug.c
@@ -2327,7 +2327,7 @@ static int try_offline_memory_block(stru
 	 * by offlining code ... so we don't care about that.
 	 */
 	page = pfn_to_online_page(section_nr_to_pfn(mem->start_section_nr));
-	if (page && zone_idx(page_zone(page)) == ZONE_MOVABLE)
+	if (page && page_zonenum(page) == ZONE_MOVABLE)
 		online_type = MMOP_ONLINE_MOVABLE;
 
 	rc = device_offline(&mem->dev);
_

Patches currently in -mm which might be from willy@infradead.org are

hugetlb-optimise-hugetlb_folio_init_tail_vmemmap.patch
migrate-optimise-alloc_migration_target.patch
memory_hotplug-optimise-try_offline_memory_block.patch